The two main types of HVAC systems are split systems and packaged systems. Split systems are composed of two separate units, an outdoor condenser and an indoor air handler. The condenser is responsible for cooling the refrigerant and the air handler is responsible for distributing the cooled air throughout the building. Packaged systems are all-in-one units that combine the condenser, air handler, and evaporator coil into one unit. These systems are typically used in smaller buildings or homes and are installed outside the building. Both types of systems are designed to provide efficient heating and cooling to the building while maintaining a comfortable indoor environment.